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September weather forecast in New Haven

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

31 August, sun

	750 mmHg		68%
	4.1 m/s		+24

31 August, Sunday. day, 26°; night, 18°; partly cloudy

1 September, mon

	750 mmHg		68%
	3.9 m/s		+24

1 September, Monday. day, 25°; night, 17°; rain

2 September, tue

	750 mmHg		69%
	4.1 m/s		+24

2 September, Tuesday. day, 25°; night, 16°; clear

3 September, wed

	750 mmHg		72%
	3.8 m/s		+24

3 September, Wednesday. day, 26°; night, 17°; partly cloudy

4 September, thu

	749 mmHg		71%
	3.8 m/s		+24

4 September, Thursday. day, 26°; night, 17°; clear

5 September, fri

	751 mmHg		68%
	4.1 m/s		+23

5 September, Friday. day, 25°; night, 17°; clear

6 September, sat

	751 mmHg		72%
	4.1 m/s		+23

6 September, Saturday. day, 25°; night, 16°; partly cloudy

7 September, sun

	750 mmHg		74%
	4.19 m/s		+24

7 September, Sunday. day, 25°; night, 16°; rain

8 September, mon

	749 mmHg		75%
	4.19 m/s		+23

8 September, Monday. day, 25°; night, 17°; overcast

9 September, tue

	750 mmHg		73%
	3.9 m/s		+23

9 September, Tuesday. day, 24°; night, 17°; overcast

10 September, wed

	751 mmHg		74%
	4.1 m/s		+23

10 September, Wednesday. day, 24°; night, 16°; partly cloudy

11 September, thu

	751 mmHg		71%
	4.3 m/s		+23

11 September, Thursday. day, 24°; night, 15°; rain

12 September, fri

	751 mmHg		72%
	4.1 m/s		+23

12 September, Friday. day, 24°; night, 15°; clear

13 September, sat

	750 mmHg		76%
	3.9 m/s		+23

13 September, Saturday. day, 24°; night, 16°; rain

14 September, sun

	750 mmHg		75%
	4.19 m/s		+23

14 September, Sunday. day, 24°; night, 16°; partly cloudy

15 September, mon

	751 mmHg		73%
	4.19 m/s		+22

15 September, Monday. day, 23°; night, 16°; clear

16 September, tue

	751 mmHg		73%
	4 m/s		+22

16 September, Tuesday. day, 22°; night, 14°; rain

17 September, wed

	751 mmHg		71%
	4 m/s		+22

17 September, Wednesday. day, 22°; night, 13°; clear

18 September, thu

	750 mmHg		74%
	4.3 m/s		+22

18 September, Thursday. day, 23°; night, 14°; partly cloudy

19 September, fri

	751 mmHg		70%
	4.4 m/s		+22

19 September, Friday. day, 22°; night, 13°; clear

20 September, sat

	751 mmHg		72%
	4.1 m/s		+22

20 September, Saturday. day, 23°; night, 14°; clear

21 September, sun

	751 mmHg		71%
	4 m/s		+22

21 September, Sunday. day, 23°; night, 14°; clear

22 September, mon

	750 mmHg		74%
	4.5 m/s		+22

22 September, Monday. day, 22°; night, 15°; overcast

23 September, tue

	750 mmHg		71%
	4.69 m/s		+22

23 September, Tuesday. day, 22°; night, 15°; clear

24 September, wed

	751 mmHg		70%
	4.19 m/s		+22

24 September, Wednesday. day, 22°; night, 13°; clear

25 September, thu

	751 mmHg		71%
	4.3 m/s		+21

25 September, Thursday. day, 21°; night, 13°; clear

26 September, fri

	750 mmHg		76%
	4.19 m/s		+21

26 September, Friday. day, 21°; night, 14°; rain

27 September, sat

	750 mmHg		78%
	4 m/s		+21

27 September, Saturday. day, 22°; night, 14°; overcast

28 September, sun

	749 mmHg		79%
	4.69 m/s		+21

28 September, Sunday. day, 21°; night, 15°; rain

29 September, mon

	749 mmHg		75%
	5 m/s		+21

29 September, Monday. day, 20°; night, 13°; rain

30 September, tue

	750 mmHg		73%
	4.6 m/s		+20

30 September, Tuesday. day, 19°; night, 12°; rain

1 October, wed

	750 mmHg		77%
	4.4 m/s		+20

1 October, Wednesday. day, 19°; night, 11°; clear

2 October, thu

	750 mmHg		73%
	4.3 m/s		+20

2 October, Thursday. day, 20°; night, 11°; partly cloudy

3 October, fri

	751 mmHg		74%
	4 m/s		+20

3 October, Friday. day, 19°; night, 11°; clear

4 October, sat

	752 mmHg		77%
	4.1 m/s		+20

4 October, Saturday. day, 19°; night, 12°; rain

Average data for 10 years

New Haven September

12

sunny days

9

days with precipitation

8

cloudy days

12 sunny days; 9 days with precipitation; 8 cloudy days;

73

%

air humidity

2.9

m/s

WindS

110

mm of precipitation

(10% of annual average)

+22

°C

Water temperature

air humidity 73%; 110 millimeters of precipitation (10% of annual average); Wind southerly 2.9 Meters per second; Water temperature +22°

Weather graphs for September

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

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S

SW

SW

SW

S

S

S

S

SW

S

S

S

SW

SW

SW

S

S

S

S

SW

S

SW

S

S

S

S

S

S

S

1

Average data for 10 years

2

3

4

5

6

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8

9

10

11

12

13

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15

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21

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30

Daytime temperature

Night-time temperature

Cities near you

New York
Boston
Philadelphia
Islandia
Colchester
Jamaica
Brooklyn
Brookhaven
Lake George

Cities with similar weather in September

Suhum
Burgas
Varna
Tivat
The Sunny Beach
Podgorica
Toronto
The Golden Sands
Chicago

The weather forecast for September 2025 is based on historical data from the past 10 years.

In September, the weather in New Haven is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, New Haven has 12 sunny, 9 rainy, 5 partly cloudy, and 4 cloudy days in September. The rains are usually heavy.

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